CHINT · Moulded case circuit breaker
Product overview
Select rated current first. The matching frame prefers S, then H where S is unavailable. Only the basic no-accessory configuration is offered here; request internal accessories separately.
This CHINT NM1-250S listing concerns moulded case circuit-breaker selection for low-voltage distribution. Match the frame, actual rated current, pole/neutral construction, release and breaking-capacity grade before choosing the installation and accessories.
Technical selection summary
| Listing model / frame | NM1-250S; frame 250 |
|---|---|
| Current selection | 160–250 A listing scope; frame size and actual rated current are different quantities |
| Pole construction | 3P as listed; confirm the full pole and neutral code, including the N-pole construction for 4P |
| Breaking-capacity grade | S; select the exact manufacturer pole/voltage column. S and H are different grades |
| Icu | Use the voltage-specific manufacturer values for the exact frame/grade/poles; Icu depends on the exact version and voltage |
| Release / accessories | Confirm the complete release/accessory code, including /3300 where ordered; undervoltage or shunt functions require the matching fitted release |
| Operating-voltage selection | Match the actual system voltage and corresponding fault-rating row; insulation voltage is not the operating-duty rating |
| Manufacturer standard reference | IEC/EN 60947-2; confirm the actual marked version and relevant supply documents |
This summary replaces the broad NM1 family table; the 10–1250 A family range and generic 25/50/65 kA text do not establish this exact configuration. Do not combine the current, pole, voltage, release and breaking-capacity columns by assumption. Use the matching manufacturer table and supplied-unit marking. Distribution and motor-protection releases, manual/motor/rotary operation, terminal layouts and neutral-pole arrangements require their own complete codes.
Typical applications
- Low-voltage distribution assemblies with coordinated protection
- Replacement procurement with exact frame, release and mounting checks
Product reference images and drawings
Match the exact current frame, voltage suffix, contact/pole construction and connection dimensions. Family images may show other versions; use the applicable manufacturer row and drawing for the ordered unit.
